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Genome Size in Anthurium Evaluated in the Context of Karyotypes and Phenotypes

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Genome Size in Anthurium Evaluated in the Context of Karyotypes and Phenotypes AoB PLANTS http://aobplants.oxfordjournals.org/ Open access – Research article Genome size in Anthurium evaluated in the context of karyotypes and phenotypes Barbara J. Bliss and Jon Y. Suzuki* USDA, ARS, Pacific Basin Agricultural Research Center, 64 Nowelo Street, Hilo, HI 96720, USA Received: 20 November 2011; Returned for revision: 16 December 2011; Accepted: 17 February 2012; Published: 29 February 2012 Citation details: Bliss BJ, Suzuki JY. 2012. Genome size in Anthurium evaluated in the context of karyotypes and phenotypes. AoB PLANTS 2012: pls006; doi:10.1093/aobpla/pls006 Abstract Downloaded from Background Anthurium is an important horticultural crop from the family Araceae, order Alismatales, a and aims lineage considered to have diverged from other monocots prior to the cereals. Genome size and its distribution in Anthurium were investigated to gain a basic understanding of genome organization in this large genus and to forge a firm foundation for advancement http://aobpla.oxfordjournals.org/ of molecular approaches for the study of Anthurium. Currently, genome size estimates have been reported for only two Anthurium samples. Methodology Bulk nuclear DNA content estimates were obtained by flow cell cytometry using leaf tissue collected from Anthurium species of different subgeneric groups and from commercial culti- vars. The most current and well-supported topology of subgeneric, sectional relationships was applied to present genome size estimates in the context of reported chromosome counts, karyotypes, putative phylogenetic relationships, observed phenotypes and pedigree. Principal results Genome size estimates based on bulk nuclear DNA content for 77 accessions representing 34 by guest on July 20, 2012 species and 9 cultivars were obtained, including initial estimates for 33 Anthurium species, and both the smallest (Anthurium obtusum; Tetraspermium) and largest (Anthurium roseospa- dix; Calomystrium) Anthurium genome sizes reported to date. Genome size did not distinguish any subgeneric section, but ranged 5-fold (4.42–20.83 pg/2 C) despite consistent 2N ¼ 30 chromosome counts. Intraspecies genome size variation .20 % is reported for Anthurium ravenii, A. watermaliense and A. gracile. Conclusions Genome size estimates for Anthurium species spanning 13 recognized subgeneric sections in- dicate that genome size does not generally correlate with chromosome count or phylogenetic relationships. Mechanisms of genome expansion and contraction, including amplification and reduction of repetitive elements, polyploidy, chromosome reorganization/loss, may be involved in genome evolution in Anthurium as in other species. The new information on Anthurium genome sizes provides a platform for molecular studies supporting further research on genome evolution as well as cultivar development. * Corresponding author’s email address: [email protected] Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. AoB PLANTS 2012: pls006; doi:10.1093/aobpla/pls006, available online at www.aobplants.oxfordjournals.org 1 Bliss and Suzuki — New genome size estimates for Anthurium spp. Introduction genome size growth (Leitch et al. 1998; Bennetzen et al. 2005). Anthurium is the most speciose genus in the Araceae, a In the family Araceae, genome sizes tend to be mod- monocot family defined by its unique inflorescence com- erate, including Orontium aquaticum (30 pg/2 C), a posed of a spadix and spathe. The spadix holds hundreds species derived from an early-diverging lineage in of minute flowers compacted on a spike, which is sub- Araceae (Cabrera et al. 2008; Cusimano et al. 2011). tended by a more or less showy sterile leaf-like organ, Genome size estimates have been reported for only the spathe. Anthurium is comprised of 900 published two Anthurium accessions: A. schlechtendalii (15.27 pg/ and 1500 estimated species endemic to the neotropical 2 C) and A. grande Hort. (27.00 pg/2 C) (26 July 2011; zones of northern Mexico and south through Central http://data.kew.org/cvalues). These are also of moderate America to southern Brazil, and on the Caribbean size with the genome size estimate for A. schlechtendalii Islands (Croat 1988, 1989; Mayo et al. 1997; Govaerts 2.8 times that of Zea mays (5.45 pg/2 C) (Bennett et al. 2011; Boyce and Croat 2012). Anthurium andraea- and Smith 1976), and the estimate for the accession num, native to Colombia, was first introduced to the A. grande Hort. nearly twice as large as that of island of Oahu in 1889, where it flourished and A. schlechtendalii (Ghosh et al. 2001). However, in became widely cultivated by amateur breeders and hob- Lemnoideae, the sister group to the true Araceae, the Downloaded from byists who developed many attractive new varieties group to which Anthurium belongs (Cabrera et al. 2008; throughout the 1940s. Beginning in 1950, an intensive Cusimano et al. 2011), the genera Lemna (1.20 pg/2 C) breeding programme at the University of Hawai‘i at and Spirodela (0.60 pg/2 C, 0.74 pg/2 C) have quite small Manoa yielded many unique and improved cultivars genome sizes (Geber 1989). The evolutionary relationship using selective breeding, hybridization and in vitro propa- of these lineages suggests that the common ancestor of http://aobpla.oxfordjournals.org/ gation of Anthurium species. The novel colours and both Lemnoideae and the true Araceae may have had in forms, as well as desirable horticultural attributes, gener- place the genomic machinery to secondarily generate ated in these cultivars contributed to the dominance of species with small genomes and that there may also be the anthurium industry by Hawaiian growers for much Anthurium species with small genome sizes. of the second half of the 20th century (Kamemoto and Understanding the organization and composition of Kuehnle 1996). We anticipate that future improvements the Anthurium genome is a prerequisite to the develop- to anthurium cultivars will utilize molecular resources ment of molecular resources to support improvement of developed to contribute to the basic understanding of the Anthurium Hort. complex. We set out to document a this large genus while supporting applied science. by guest on July 20, 2012 wider range of Anthurium genome sizes and interpret Genome size has implications for molecular biology them in the context of the most recent phylogenetic work, genomics and overall successful implementation analysis of Anthurium species (Carlsen 2011), referencing as a study organism. Genome size is also correlated cytological observations and known mechanisms of with seed mass, cell size, stomatal size, stomatal genome size evolution to identify trends in genome evo- density, length of cell cycle and a host of derivative lution in Anthurium. We sampled most deeply the phenotypes important for plant success (Beaulieu et al. natural, easily recognized sections Calomystrium and 2007, 2008; Leitch et al. 2007; Hodgson et al. 2010). Cardiolonchium from which the Anthurium Hort. Genera with larger genome sizes have limited photosyn- complex mainly derives in order to better explore the thetic rates, tend to have limited distribution and tend to extent of evolutionary change and gain insight into the be less speciose (Knight et al. 2005). Genome size in events influencing genome evolution in these clades. angiosperms varies 1000-fold (Leitch et al. 2005) with the largest genomes found among the monocots (Leitch et al. 2010; Zonneveld 2010). Variations in angio- sperm DNA content (Bennett and Leitch 2005)have Materials and methods been interpreted in a robust phylogenetic context to Nuclear genome size estimations were obtained by flow reconstruct genome size evolution, revealing the ances- cell cytometry following the protocol described by Aru- tral genome size to be relatively small (1.4 pg/1 C) (Soltis muganathan and Earle (1991). Genome sizes were et al. 2003). Significant increases in genome size have obtained for 81 accessions obtained from botanical been attributed to polyploidy and to amplification of gardens, anthurium industry growers and cultivar devel- repetitive DNA content (SanMiguel et al. 1996; Vicient opers. Tissue samples of 50 mg fully expanded, non- et al. 1999; Hawkins et al. 2006). Secondary downsizing senescing leaf tissue were collected and shipped to in lineages embedded within clades having larger arrive for analysis within 24 h of collection. Flow cytome- genome sizes counters the overall trend towards try involves chopping of fresh plant material together 2 AoB PLANTS 2012: pls006; doi:10.1093/aobpla/pls006, available online at www.aobplants.oxfordjournals.org Bliss and Suzuki — New genome size estimates for Anthurium spp. with an internal standard (Galbraith et al. 1983). Ideal in- in our Anthurium samples. However, when barley was ternal standards display minimal variability (Baranyi and used, sample peaks frequently overlapped those of the Greilhuber 1996), match as closely as possible the con- internal standard, so most genome sizes are reported figuration of DNA (e.g. chromosome structure) in the using wheat as the internal standard. When overlapping nucleus of the sample, and have a genome size larger peaks prevented interpretation of results with wheat, or if than that of the sample, but not .4 times larger the genome size
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